Olathe, Kansas Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Olathe weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:22 AM CDT · Open-Meteo
- TodaySep 21Drizzle later—0.05″70°62°—
- TuesdaySep 22Overcast——73°60°+3°
- WednesdaySep 23Overcast——77°53°+4°
- ThursdaySep 24Overcast——79°56°+2°
- FridaySep 25Light Drizzle31%—85°62°+6°
- SaturdaySep 26Drizzle47%—88°64°+3°
- SundaySep 27Light Drizzle29%—80°64°-8°
Air quality now AQI 24 · Good
AQI 24 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 8 PM.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:49 PM
- Moonset
- 1:45 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Olathe at a glance
- Today vs. normal: Today averages 66°F (high 70°F, low 62°F), 4°F below the 70°F normal for Sep 21
- Last frost: April 10 (1991–2020 median, NOAA station 5 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Olathe
- Mon70°62°8%
- Tue73°60°2%
- Wed77°53°0%
- Thu79°56°9%
- Fri85°62°31%
- Sat88°64°47%
- Sun80°64°29%
- Mon84°62°31%
- Tue82°62°40%
- Wed79°55°16%
- Thu88°60°11%
- Fri89°66°29%
- Sat82°63°24%
- Sun63°48°16%
- Mon65°43°19%
- Tue64°45°17%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Olathe
Interactive wind and temperature map centered on Olathe — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 29) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Olathe
Olathe sits in Johnson County, where the year’s longest day runs 14h 54m of daylight and its shortest just 9h 26m — a swing of +5h 28m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Wichita, the state’s largest city, lies about 160 miles to the WSW. The nearest town Olathe tracks is Overland Park, roughly 7 miles to the E.
Air quality in Olathe
Air quality in Olathe’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 41). See the full air-quality history for Olathe.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | spinach, radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
July is Olathe's warmest stretch (~81°F) and January its coldest (~30°F); precipitation crests in May at 5.7 inches and ebbs in January to 1.4 inches.
| Month | Mean temp | Precip |
|---|---|---|
| January | 30° | 1.4″ |
| February | 34° | 1.5″ |
| March | 44° | 3.4″ |
| April | 56° | 3.9″ |
| May | 65° | 5.7″ |
| June | 75° | 5.5″ |
| July | 81° | 3.4″ |
| August | 80° | 3.5″ |
| September | 72° | 3.0″ |
| October | 59° | 3.2″ |
| November | 44° | 3.1″ |
| December | 32° | 1.9″ |
Regional context
Similar climates Lenexa, KS, Overland Park, KS, Gardner, KS
Olathe's climate, from modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo), pairs 30°F Januarys with 81°F Julys — a 52°F swing. About 39.4 inches of precipitation falls each year.
Olathe's rain peaks in summer: May brings 5.7 inches, while January sees just 1.4 inches under cooler, drier air. That summer-storm rhythm groups Olathe with places like Lenexa, KS, Overland Park, KS and Gardner, KS.
Olathe's growing window opens around April 10, once Olathe's overnight lows stop freezing — sow kale, peas, spinach, and parsnips. Hold Olathe's tender crops — tomatoes, peppers, basil — until 10-14 days past Olathe's last frost. It shuts near October 29, when freezes return to Olathe and tender plants need cover. In about half of years, Olathe's last freeze comes after April 10.
Similar climates: Lenexa, KS, Overland Park, KS, Gardner, KS, Spring Hill, KS, Shawnee, KS.
Frequently asked
- When does it freeze in Olathe?
- In Olathe, expect the last spring frost near April 10; Olathe's first autumn frost comes around October 29.
- What is the rainy season in Olathe?
- Rainfall in Olathe peaks in May near 5.7 inches, out of about 39 inches annually.
- What is the warmest month in Olathe?
- Olathe peaks in July, when the mean runs near 81°F.
- What is the coldest month in Olathe?
- January is Olathe's coldest month, averaging about 30°F.
- When can I start a vegetable garden in Olathe?
- Around April 10, start frost-hardy crops in Olathe; tomatoes and basil belong a fortnight later.
- What hardiness zone is Olathe?
- With January around 30°F, Olathe's zone reflects that minimum — the USDA ZIP map confirms Olathe's band.
- What is the 10-day forecast for Olathe?
- Olathe's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Olathe?
- See this week's day-by-day rain chances for Olathe in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Olathe?
- Current conditions for Olathe and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Olathe forecast updated?
- The Olathe forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Olathe?
- Today's sunrise and sunset times for Olathe are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Olathe?
- The next few days in Olathe's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Olathe sits at 38.9°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Olathe
- 66051
- 66061
- 66062
- 66063